Incandescent-mantle support.



No. 694,347. P-atentq Mar. l4, |902.

J. F. smanow. INCANDESGENT MANTLE SUPPORT.

(Application mea June 4, 1901.5

(No Model.)

UNITED STATES! JOHN F. BREDOl/V, OF DAVENPORT, IOWA, ASSIGNOR TO TI-IE IOVA MANTLE PATENT OFFICE.

MANUFACTURING COMPANY, A CORPORATION OF IOWA.

INCANDESCENT-VIANTLE SUPPORT.

SPEGIFICATION forming part of Letters Patent No. 694,347, Adated. March 4, 1902.

Application filed J' une 4, 1901.

To all whom t may concern? Be it known that I, JOHN F. BREDOW, a citizen of the United States, residing at Davenport, in the county of Scott and State of Iowa, have invented certain new and useful Improvements in Incandescent-Mantle Supports, of which the following is a specification, reference being had therein to the accompanying drawings.

In the use of incandescent mantles for lighting purposes it is necessary to provide a support to maintain the mantle in a central position over the heating-flame and centrally of the chimney, and for this purpose it is customary to provide a supporting rod or wire projecting upwardly from the burner or gallery of the lamp, from which the mantle is suspended. It is preferable to use a supporting-rod which passes up through the interior of the hollow mantle, for the reason that such centrally-placed rod not only does not cast any shadow, as is the case where the side supporting-rod is used, but also gives a lamp of much better appearance and more compact construction. One difficulty, however, has been found to exist iny connection with the centrally-placed mantle-supportin g rod which renders its use objectionable, and that is that the rod being directly in the heating-zone of the flame for its entire length is quite apt to become burned or overheated to such an extent that it warps or buckles, and falling sidewise throws the fragile mantle against the chimney, fracturing and destroying such mantle prematurely and often breaking the chimney.

One of the objects of the present invention is to overcome the difficulty found with the central supporting-rods now in use, and the mantle-support which I have invented and which I shall describe in detail hereinafter (reference being had to the drawings accompanying and forming part of this specification) is so designed as to overcome this objection.

A further object of my invention is to provide a mantle-support and carriergwhich is adaptable to burners of different diameters, so that it can be readily fitted to dierent makes and sizes within a considerable range.

I have also provided a peculiar and novel Serial No. 63,060. (No model.)

burning-surface which is calculated to bring the heating-flame into closer relation to the mantle than heretofore and secure a higher, and consequently brighter, condition of incandescence than is possible with the burners now in use.

Other objects aud novel features of the invention will be specifically pointed out in the detailed description hereinafter, and the features of novelty and of my invention will be particularly set forth in the claims appended hereunto.

In the drawings one embodiment of my invention is shown, and in saiddrawings Figure -lis a central vertical section of a lamp-burner with my improved mantle -support applied thereto. Fig. 2 is a View of the burner-cap and mantle-carrier applied to a burner of slightly-larger diameter than that shown in Fig. l. Fig. 3 is a detail View of the burnercap and mantle-carrier shown in Figs. 1 and 2. Fig. 4 is a detail sectional view of a burnercap embodying the same feature of adaptability to different-sized burners, but of slightly different construction. Fig. 5 is a top view of the burner-cap to show the peculiar construction ofthe burnin g-surface which insures the close relation of the flame and mantle. Fig. 6 is a detail view to which reference will be made hereinafter.

Referring to the drawings by numerals, similar characters indicating like parts in the several views, 1 designates a burner of any ordinary or preferred construction. Upon said burner is a burner cap or thimble 2, having a foraminous or gauze burning-surface 3 and having its body portion 4 formed with a tapering or downwardly-flaring wall, so that the said cap 2 may be readily fitted to burners of different sizes within a limited range, as .illustrated in Figs. l and 2, in which the diameters of the burner-bodies are somewhat different.

In the form of cap shown in Fig. 4 the body portion 4, instead of being coned or tapered, is formed with a lower portion 5, having vertical walls and being of larger diameter than the upper part 6a, which is inwardly stepped or offset relative to said lower portion 5, so that the cap may be fitted to burners of different sizes. Said body portion 4 has a lip 5 IDO turned or crimped inwardly at its top over the edge of the gauze burning-surface 3, which is preferably formed of a disk 6 of wire-gauze 'or other reticulated material, said inwardlyraise the said mantle to a high incandescence and increase the intensity of the light. Centrally of said cap 2 is placed a socket-piece 7, which receives the lower end of the mantlesupporting rod 8, said socket 7 being secured in place in any suitable manner and being of sufficient depth to hold the said mantle-support 8 firmly in place. The socket 7, which may be formed of a tough grade of iron, platinum, vitreous material, or any other material capable of resisting an'cxcessive degree of heat, preferably extends upwardly some distance above the burning-surface 3, so as to steady the mantle-support 8 and at the same time protect it at its lower end from the intense heat generated at that point, this being the point at which the mantle-support is most'likely to weaken under the heating action of the llame, The support 8 is preferably formed of two wires, of proper temper to 'withstand a high degree of heat, twisted closely together, so as to form practically a single rod and give a support of great rigidity, which rises to the proper height within the chimney 9 to accommodate the mantle l0 and carry it in such position that its lower-end will skirt the top of the burner cap or thimble 2, it being vunderstood that the mantlesupporting rod 8 is adjustable to some extent in its socket 7, being held by friction in its adjusted position, although it may be rigid or securely fastened in said socket '7, if desired.

The upper ends of the wires forming the mantle-support 8 are left free and untwisted and are bent at right angles to the body of the support, so as to form horizontally-projecting arms l1 1l, said arms 11 1I extending horizontally a sufficient distance to project beyond the circumference of the mantle and bring their ends into close proximity to or in light contact with the inside of chimney 9. The transverse supporting thread or Wire 12, carried by the mantle 10, rests in the crotch formed by spreading the ends 11 11 of the Wires, as shown in Fig. 6, and in order to lock the mantle inplace on the support and secure it against accidental displacement I give the ends 1l 11 of the wires a half-turn, as shown in Fig. l, thus crossing them upon each other and closing the crotch, so as to lock the transverse thread or wire 1l within the closed loop 13 thus formed.

From the foregoing it will be seen that should excessive heat weaken the support 8 and cause it to buckle or Warp even slightly the horizontally-projecting arms l1 Il of the support will strike against the chimney and maintain the Asupport and mantle in an upright position,.and so obviate all danger of breaking the fragile mantle by throwing it against the chimney in event of a collapse or bending of the' said support.

It will be apparent thatthe horizontallyprojecting arms 1l 11 may be made of any length suitable tothe diameter of the globe or chimney Within which the mantle is placed.

In addition to its usefulness in connection with the lamp my support is of great value as a guard for the mantles during transportation,for as these mantles are usually shipped with supports and burner caps or thimbles attached in cylindrical shipping-cases it will be obvious that lthe free ends 1l 1l of the wires Will rest against the sides ofthe box or shipping-case and prevent jostli ng and crushy ing of the mantle, provision VVbeing made to support and maintain the burner cap or thimble at the lower end centrally of the case, as is customary in this particular type of shipping case or shell. Furthermore, the protecting-arms ll 1l of the support 8 provide a convenient means for handling ythe mantles, as these arms may bereadily,grasped,and all danger of fracturing the mantle during handling is thereby avoided.

It will be seen that I have shown and` described two wires twisted together; butI do knot Wish to be understood as limiting myinvention to this detail of construction, as the support may be made of material other than` wires-as, for example,a single rod having a split upper end .to form the spreading fingers-or the numberof interlaced or twisted wires and the number of horizontally-projecting arms may be increased as desired and yet be within the range of my invention. Other variations of thel constructions shown and described may be made within the range of mechanical skill without departing from the spirit of theinvention, and Ido not, therefore, limit myinvention tothe details of construction shown, except so far as it is limited by the terms of the appended claims, as I have merely shown and described one form or embodiment of the invention.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. A mantle-support for incandescent mantles consisting of a central supporting-rod ICO IIO

having horizontallyprojecting mantle centering arms at its uppei` end adapted to bear at their ends against the chimney of the lamp.

2. A mantle-support for incandescent mantles consisting of a central supporting rod or Wire having two horizontally-projecting mantle-centering arms at its upper end, said arms being crossed to form a central closed loop for the reception of the transverse mantlesupporting cord and adapted to bear at their ends against the chimney of the lamp.

3. A mantle-support for incandescent mandes formed of a plurality of wiresinterlaced or twisted together througlla portion of their length to form a central supporting-rod, the upper ends of said wires being untwisted and bent at right angles to the twisted portion to form mantle-centering arms adapted to bear at their ends against the chimney of the lamp.

4. A mantle-support for incandescent mantles formed of two wires twisted together through a portion of their length to form a central supporting rod, said wires having their upper ends untwisted and bent at right angles to said twisted portion to form mantlc-centering arms adapted to bear at their ends against the chimney of the lamp.

5. A mantle-support for incandescent mantles formed of two wires twisted together through a portion ofv their length to form a central supporting-rod, said wires having free, untwisted vupper ends projecting at right angles tothe said `twisted portion, to form mantlc-centering arms adapted to bear at their endsagainst the chimney of the lamp, the said arms being crossed upon each other to form a closed loop-for the reception of the transverse mantle-cord.

6. In an incandescent-mantle support,-the combination with a burner cap or thimble having a centrally-placed socket therein, of a central mantle-supportingrod lnounted in said socket, said'mantle-supporting rod having horizontally-projecting arms at its upper'end to maintain the mantle in a central position within lthe chimney.

7. In an incandescent-mantle support, the combination with a burner cap or thimble having a centrally-placed socket therein, of a cen- -tral mantle-supporting rod adj ustably mounted in said socket, said mantle-supporting rod havin g horizontally-proj ecting arms at its upper end to maintain the mantle in a central vposition within the chimney.

8. In an incandescent-mantle support, the

' combination with a burner cap or thimble, of

a centrally-placed socket carried thereby, aV

central mantle-supporting rod having horizontally-projecting arms at its upper end to maintain the mantle in central position within the chimney, said rod being mounted in said socket, the said socket projecting-above the top of the burner-cap and surrounding the lower end of the mantle-supporting rod to protect it from excessive heat.

9. A burner-cap for incandescent burner having a body portion and a foraminous burning-surface, said body portion having an inwardly-turned lip at its yupper end, said lip having portions of its edge cut away.

lO. In a burner-cap for incandescent burners, the combination with a body portion, of a disk mounted in the top of said body portion to form a burning-surface, said body portion having an inwardly-turned lip atits upper end to secure said foraminous disk in place, said lip having its edge notched or serrated. 1l. In an incandescent burner and in combination, a burner, a detachable burner-cap,

`a foraminous disk toform a burning-surface secured to said burner-cap by means of an inwardly-projecting, serrated lip or yflange, a

socket-piece mounted centrally of said .fo-

raminous disk and projecting upwardly therefrom,` a mantle support mounted in said socket-piece, a mantle carried by said support and surrounding said burner-cap at its lower end, and means at the upper end of said mantle-support to center the mantle at its top within the chimney or globe. l

12. A detachable burner-cap for incandescent burners having a lower portion 5a with vertical walls, and an upper inwardly-stepped portion 451 of smaller diameter than said lowerl portion; whereby said cap is adapted to be fitted to and `used with burners of different diameters.

In testimony whereof I affix my signature in presence of two witnesses. j

JOI-IN F. BREDOW.

Witnesses:

OTTO LEHMAN, MARY A. PERRY. 

